- From: Tab Atkins Jr. <jackalmage@gmail.com>
- Date: Thu, 13 Nov 2014 17:48:01 -0800
- To: Benjamin Poulain <benjamin@webkit.org>
- Cc: www-style list <www-style@w3.org>
On Wed, Nov 12, 2014 at 8:30 PM, Benjamin Poulain <benjamin@webkit.org> wrote: > On 11/11/14 4:14 PM, Tab Atkins Jr. wrote: >> >> On Mon, Nov 10, 2014 at 8:40 PM, Benjamin Poulain <bpoulain@apple.com> >> wrote: >>> >>> It looks like it would be useful to include :only-of(selector list) in >>> Selectors Level 4. >>> >>> It is already possible to achieve the same behavior by using :nth-child(1 >>> of selector list):nth-last-child(1 of selector list) but that is >>> significantly uglier. Repeating the selector list is error prone when >>> updating the stylesheet and the specificity is doubled. >>> >>> The selector :only-of(selector list) would behave like :nth-child(1 of >>> selector list):nth-last-child(1 of selector list) but with lower specificity >>> (accounting for the selector list once instead of duplicating it). The >>> definition of :only-of-type is pretty much the same. >>> >>> The implementation is trivial based on the existing :nth-child() and >>> :nth-last-child(). The single :only-of() is likely to be more efficient than >>> :nth-child():nth-last-child() in most implementations. >> >> >> Do you have some use-cases to share that would use this? > > > Pretty much the same uses use cases of :only-of-type and :only-child exists > for :only-of. > > Many designs are based on classes or data attributes. Having :only-of-type > does not help in those cases. Sounds reasonable. I'll bring it up at the next telcon. ~TJ
Received on Friday, 14 November 2014 01:48:47 UTC